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Simplified HVAC
system monitoring
A range of HVAC smoke detectors for reliable, always-on monitoring of HVAC system fires, smoke.


Detect HVAC Fires, Prevent Smoke Recirculation

This broad range of HVAC duct smoke detectors from Honeywell System Sensor combine an impressive collection of innovations to greatly simplify HVAC system monitoring. One unit can accommodate multiple installation footprints to overcome mounting constraints. Plug-in sampling tubes speed up and simplify installation without tools. Broad temperature and humidity ranges accommodate exposure to environmental extremes. Easily visible status indications, readily accessible test feature, and multiple compatible accessories simplify testing and maintenance. With unmatched flexibility and reliable performance, these sensors can adjust to fit any application.


Easy Installation, Dependable HVAC Performance
Each device complies with global and national safety standards for HVAC fire and smoke safety.


InnovairFlex™ 4-wire Duct Smoke Detector, 120 VAC

The D4120, 4-wire photoelectric duct smoke detector features a pivoting housing that fits both square and rectangular footprints and mounts to round or rectangular ductwork. This unit senses smoke even in the most challenging conditions, operating in air flow speeds from 100 to 4,000 feet per minute, temperatures of–4°F to 158°F, and a humidity range of 0 to 95% (non-condensing). A plug-in sensor head offers improved false alarm immunity and simple installation, testing and maintenance. The improved cover design isolates the sensor head from the low-flow feature for simple maintenance.

  • Photoelectric, integrated low-flow technology
  • Plug-in sensor offers superb false alarm immunity and the latest sensor technology
  • Patented sampling tube installs from front or back of the detector with no tools required
  • Increased wiring space with a newly added ¾-inch conduit knockout
  • One easy-access Test/Reset button and improved LED status
  • Patented interconnect feature for multi-fan shutdown
  • High-contrast terminal designations
  • Built-in short circuit protection from operator wiring errors
  • Field selectable settings for configuring the detector
One product, many applications
Residential Buildings
Educational Institutions
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